UE monitoring configuration method and apparatus

ABSTRACT

A method and an apparatus for configuring a function of monitoring events concerning user equipment (UE) are provided. The method of a home subscriber server (HSS) includes receiving a first request message including monitoring event information from a service capability exposure function (SCEF), setting, if the monitoring event information is set to loss of connectivity, a mobility-related timer of a terminal to a value based on a value of a maximum detection time included in the first request message, and transmitting a second request message including the monitoring event information and the set mobility-related timer of the terminal to a mobility management entity.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is a continuation application of a U.S. patentapplication filed on May 12, 2016 in the United States Patent andTrademark Office and assigned Ser. No. 15/153,145 and claims the benefitunder 35 U.S.C. § 119(e) of a U.S. Provisional application filed on May15, 2015 in the U.S. Patent and Trademark Office and assigned Ser. No.62/161,991, the entire disclosure of which is hereby incorporated byreference.

TECHNICAL FIELD

The present disclosure relates to a mobile communication system. Moreparticularly, the present disclosure relates to a method and apparatusfor configuring a function of monitoring events concerning userequipment (UE).

BACKGROUND

In order to meet the increasing wireless data traffic demand since thecommercialization of 4th generation (4G) communication systems, thedevelopment focus is on the 5th generation (5G) or pre-5G communicationsystem. For this reason, the 5G or pre-5G communication system is calleda beyond 4G network communication system or a post long term evolution(LTE) system. In order to accomplish a high data rate, it is consideredto implement the 5G communication system using a millimeter wave(mmWave) band (e.g., 60 GHz band). In order to mitigate propagation lossand increase propagation distance, the 5G communication system is likelyto accommodate various techniques such as beamforming, massivemultiple-input multiple-output (MIMO), full dimensional MIMO (FD-MIMO),array antenna, analog beamforming, and large scale antenna. Also, forthroughput enhancement of the 5G communication system, research is beingconducted on various techniques such as small cell, advanced small cell,cloud radio access network (cloud RAN), ultra-dense network, device todevice communication (D2D), wireless backhaul, moving network,cooperative communication, coordinated multi-points (CoMP), andinterference cancellation. Furthermore, the ongoing researches includethe use of hybrid frequency-shift keying (FSK) and quadrature amplitudemodulation (QAM) modulation and sliding window superposition coding(SWSC) as advanced coding modulation (ACM) scheme, filter bank multicarrier (FBMC), non-orthogonal multiple access (NOMA), and sparse codemultiple access (SCMA).

Meanwhile, the Internet is evolving from the human-centric communicationnetwork in which information is generated and consumed by human to theInternet of things (IoT) in which distributed things or componentsexchange and process information. The combination of the cloudserver-based big data processing technology and the IoT begets Internetof Everything technology. In order to secure the sensing technology,wired/wireless communication and network infrastructure, serviceinterface technology, and security technology required for implementingthe IoT, recent research is focused on the sensor network, machine tomachine (M2M), and machine type communication (MTC) technologies. In theIoT environment, it is possible to provide an intelligent Internettechnology (IT) which is capable of collecting and analyzing datagenerated from the connected things to create new values for human life.The IoT can be applied to various fields such as a smart home, a smartbuilding, a smart city, a smart car or a connected car, a smart grid,health care, a smart appliance, and a smart medical service, throughlegacy information technology (IT) and convergence of variousindustries.

Thus, there are various attempts to apply the IoT to the 5Gcommunication system. For example, the sensor network, M2M, and MTCtechnologies are implemented by means of the 5G communicationtechnologies such as beamforming, MIMO, and array antenna. Theapplication of the aforementioned cloud RAN as a big data processingtechnology is an example of convergence between the 5G and IoTtechnologies.

Meanwhile, the necessity for monitoring a user equipment (UE) which hasacquired a communication capability from the mobile communication systemis on the rise, and various monitoring configuration schemes areconsidered to achieve this object.

The above information is presented as background information only toassist with an understanding of the present disclosure. No determinationhas been made, and no assertion is made, as to whether any of the abovemight be applicable as prior art with regard to the present disclosure.

SUMMARY

Aspects of the present disclosure are to address at least theabove-mentioned problems and/or disadvantages and to provide at leastthe advantages described below. Accordingly, an aspect of the presentdisclosure is to provide a method for configuring a function ofmonitoring events occurring at a user equipment (UE) which has acquireda communication capability.

Another aspect of the present disclosure is to provide a method forupdating subscriber information when the communication pattern of the UEis changed.

In accordance with an aspect of the present disclosure, a method of ahome subscriber server (HSS) is provided. The method includes receivinga first request message including monitoring event information from aservice capability exposure function (SCEF), setting, if the monitoringevent information is set to loss of connectivity, a mobility-relatedtimer of a terminal to a value based on a value of a maximum detectiontime included in the first request message, and transmitting a secondrequest message including the monitoring event information and the setmobility-related timer of the terminal to a mobility management entity.

In accordance with another aspect of the present disclosure, a method ofan SCEF is provided. The method includes receiving a first requestmessage including monitoring event information from an external server,and transmitting a second request message including the monitoring eventinformation to an HSS, wherein the first and second request messagesinclude, if the monitoring event information is set to loss ofconnectivity, a maximum detection time, and the mobility-related timerof a terminal is set by the HS S to a value based on a value of themaximum detection time and a third request message including themonitoring event information and the set mobility-related timer of theterminal is transmitted from the HSS to the mobility management entity.

In accordance with another aspect of the present disclosure, an HSS isprovided. The HSS includes a transceiver configured to transmit andreceive signals to and from an SCEF and a mobility management entity,and a control unit configured to control the transceiver to receive afirst request message including monitoring event information from theSCEF, set, if the monitoring event information is set to loss ofconnectivity, a mobility-related timer of a terminal to a value based ona value of a maximum detection time included in the first requestmessage, and control the transceiver to transmit a second requestmessage including the monitoring event information and the setmobility-related timer of the terminal to the mobility managemententity.

In accordance with still another aspect of the present disclosure, anSCEF is provided. The SCEF includes a transceiver configured to transmitand receive signals to and from an external server and an HSS, and acontrol unit configured to control the transceiver to receive a firstrequest message including monitoring event information from the externalserver and transmit a second request message including the monitoringevent information to the HSS, wherein the first and second requestmessages include, if the monitoring event information is set to loss ofconnectivity, a maximum detection time, and the mobility-related timerof a terminal is set by the HSS to a value based on a value of themaximum detection time and a third request message including themonitoring event information and the set mobility-related timer of theterminal is transmitted from the HSS to the mobility management entity.

Other aspects, advantages, and salient features of the disclosure willbecome apparent to those skilled in the art from the following detaileddescription, which, taken in conjunction with the annexed drawings,discloses various embodiments of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features, and advantages of certainembodiments of the present disclosure will be more apparent from thefollowing description taken in conjunction with the accompanyingdrawings, in which:

FIG. 1 is a diagram illustrating a mobile communication system whichconnects a user equipment (UE) to an external server according to anembodiment of the present disclosure;

FIG. 2 is a diagram illustrating a mobile communication system having aservice capability exposure function (SCEF) for exposing servicecapabilities to an external server (e.g., application server (AS))according to an embodiment of the present disclosure;

FIG. 3 is a signal flow diagram illustrating a UE monitoringconfiguration method according to an embodiment of the presentdisclosure;

FIG. 4 is a signal flow diagram illustrating a subscriber informationupdate method, when the UE communication pattern is changed, accordingto an embodiment of the present disclosure;

FIG. 5 is a block diagram illustrating a schematic configuration of ahome subscriber server (HSS) according to an embodiment of the presentdisclosure; and

FIG. 6 is a block diagram illustrating a schematic configuration of anSCEF according to an embodiment of the present disclosure.

Throughout the drawings, like reference numerals will be understood torefer to like parts, components, and structures.

DETAILED DESCRIPTION

The following description with reference to the accompanying drawings isprovided to assist in a comprehensive understanding of variousembodiments of the present disclosure as defined by the claims and theirequivalents. It includes various specific details to assist in thatunderstanding but these are to be regarded as merely exemplary.Accordingly, those of ordinary skill in the art will recognize thatvarious changes and modifications of the various embodiments describedherein can be made without departing from the scope and spirit of thepresent disclosure. In addition, descriptions of well-known functionsand constructions may be omitted for clarity and conciseness.

The terms and words used in the following description and claims are notlimited to the bibliographical meanings, but, are merely used by theinventor to enable a clear and consistent understanding of the presentdisclosure. Accordingly, it should be apparent to those skilled in theart that the following description of various embodiments of the presentdisclosure is provided for illustration purpose only and not for thepurpose of limiting the present disclosure as defined by the appendedclaims and their equivalents.

It is to be understood that the singular forms “a,” “an,” and “the”include plural referents unless the context clearly dictates otherwise.Thus, for example, reference to “a component surface” includes referenceto one or more of such surfaces.

FIG. 1 is a diagram illustrating a mobile communication system whichconnects a user equipment (UE) to an external server according to anembodiment of the present disclosure.

Referring to FIG. 1, although the various embodiments of the presentdisclosure are directed to long term evolution (LTE) and evolved packetcore (EPC) represented by a radio access network (RAN) 110 and a corenetwork (CN) 120 of FIG. 1 as standardized by the 3^(rd) generationpartnership project (3GPP), it will be understood by those skilled inthe art that the present disclosure can be applied even to othercommunication systems having the similar technical background andchannel format, with a slight modification, without departing from thespirit and scope of the present disclosure. A UE 100 may communicatewith various application servers (ASs) 170 located in a public datanetwork (PDN) 190. The UE 100 and the AS 170 communicate through acommunication path represented by a line 135 in a mobile communicationsystem 150.

In various embodiments of the present disclosure, every operation andmessage may be selectively performed or omitted. In every embodiment ofthe present disclosure, two successive operations may be performedsubstantially at the same time or in reverse order. Also, messages maybe transmitted at the same time or in a different sequential order.Every operation and message may be performed independently.

Some or all of the disclosures described below are provided to helpunderstand the present disclosure. Accordingly, the detaileddescriptions of the disclosures are to express part of the method andapparatus proposed in the present invention. That is, it is preferred toapproach the content of the specification semantically rather thansyntactically. Although various embodiments of the present disclosurehave been described using specific terms, the specification and drawingsare to be regarded in an illustrative rather than a restrictive sense inorder to help understand the present disclosure. It is obvious to thoseskilled in the art that various modifications and changes can be madethereto without departing from the broader spirit and scope of thedisclosure.

FIG. 2 is a diagram illustrating a mobile communication system having aservice capability exposure function (SCEF) for exposing servicecapabilities to an external server (e.g., AS) according to an embodimentof the present disclosure.

Referring to FIG. 2, the UE 100, which has acquired a communicationcapability from the mobile communication system 150, may communicatewith ASs 170 located on the PDN 190. The communication link between theUE 100 and the AS 170 via the RAN 110 and the CN 120 is represented bythe line 135. It may be possible for the AS 170 to provide the UE 100with various services only through (application level) communication.However, the AS 170 may exchange supplementary information with themobile communication system 150 to provide the UE 100 with more suitableservices. For example, the mobile communication system 150 may notifythe AS 170 of attachment/detachment of a subscriber identity module(SIM) to the UE 100 such that the AS 170 provides the UE 100 withsituation-specific management services.

The AS 170 and the mobile communication system 150 may be owned bydifferent operators. Accordingly, the AS 170 may not be allowed toexchange information directly with the entities of the mobilecommunication systems 150 for security reasons. In order to address thisissue, 3GPP release 13 adopts SCEF which, as implied from its name, isan entity for securely exposing the service capabilities supported bythe mobile communication system 150 to the (external) AS 170. The AS 170receives the information on the service capabilities of the mobilecommunication system 150 from an SCEF 200.

In an embodiment of the present disclosure, the mobile communicationsystem 150 is provided with a method for configuring a function ofmonitoring events occurring at UEs and transmitting relevant informationto the AS 170 via the SCEF 200.

FIG. 3 is a signal flow diagram illustrating a UE monitoringconfiguration method according to an embodiment of the presentdisclosure.

Referring to FIG. 3, an AS 315 may send an SCEF 310 a Monitoring Requestmessage at operation 320. The AS 315 may transmit the Monitoring Requestmessage to the SCEF 310 directly or via a service capability server(SCS). For explanation convenience, an external entity which exchangesinformation with the SCEF 310 is referred to as SCS/AS 315. The SCS mayinclude a platform supporting at least one application service.

The Monitoring Request message transmitted by the SCS/AS 315 may includeat least one of the following parameters:

-   -   SCS/AS identification (ID)    -   SCS/AS reference ID    -   monitoring type    -   UE ID (external ID or MSISDN)    -   monitoring duration    -   maximum detection time

The SCS/AS ID is the identifier of the SCS/AS 315 which transmits theMonitoring Request message, and the SCS/AS Reference ID is theidentifier of the monitoring transaction between the SCS/AS 315 and SCEF310.

The monitoring type is the information indicating a UE monitoring eventin the form of a parameter representing the type of information whichthe SCS/AS 315 wants to receive from the mobile communication system.For example, the monitoring type may be classified into at least one offollowings:

-   -   Loss of connectivity: To monitor UEs for an event of detecting        an unreachable UE in the mobile communication system and, when        such an event is detected, report the event.    -   Location reporting: To monitor UEs for an event in which a        predetermined criterion of a UE is fulfilled (e.g., cell change        and tracking area change occurs) and, when such an event is        detected, report the event.

The UE ID may be an identifier which can be used at the applicationlevel. The UE ID may be a phone number (MSISDN) or other types ofexternal ID (e.g., email address).

The monitoring duration is a parameter indicating a time period for themobile communication system to monitor for the event indicated by themonitoring type. Preferably, this parameter may be set to an absolutetime (e.g. 14:00 Apr. 14, 2016). The reason is as follows. The mobilecommunication system entities joining the monitoring may include amobility management entity/serving general packet radio service (GPRS)support node (MME/SGSN) 300. The MME/SGSN serving the UE may change asthe UE roams. Accordingly, if the monitoring duration is provided in anon-absolute value format (e.g., 3 hours), the UE which moves to anotherMME/SGSN has to laboriously inform of the period reduced as much as thetime during which it has been served by the old MME/SGSN. Furthermore,it is difficult to check the signaling delay time for moving to the newMME/SGSN and thus may cause inaccuracy problem.

The maximum detection time is a parameter included in the MonitoringRequest message, only when the monitoring type is set to loss ofconnectivity, to indicate a maximum monitoring period for monitoringcommunication with the UE. If there is no communication with the UEduring the maximum detection time, it may be reported to the SCS/AS 315that the corresponding UE is unreachable. The maximum detection time maycorrespond to a mobile reachability timer of the mobile communicationsystem.

The Monitoring Request message transmitted by the SCS/AS 315 may furtherinclude a parameter commanding the deletion of the monitoringconfiguration. The monitoring configuration deletion command may betransmitted along with the SCS/AS reference ID used in configuring themonitoring service.

The SCEF 310 performs authorization on the Monitoring Request message atoperation 325. For example, the SCEF 310 may check whether the SCS/AS315, which has transmitted the Monitoring Request message, is authorizedfor Monitoring Request. If the SCS/AS 315 is authorized successfully,the SCEF 310 may generate an SCEF reference ID corresponding to theSCS/AS reference ID.

The SCEF 310 may transmit the Monitoring Request message to a homesubscriber server (HSS) 305 at operation 330. The Monitoring Requestmessage transmitted at this operation may include at least one of thefollowing parameters:

-   -   SCEF ID    -   SCEF reference ID    -   monitoring type,    -   UE ID (external ID or MSISDN)    -   monitoring duration    -   maximum detection time

The SCEF ID is an identifier of the SCEF 310 which transmits theMonitoring Request message, and the SCEF reference ID is a parameterrelated to the received SCS/AS reference ID. The monitoring type, UE ID,monitoring duration, and maximum detection time are parameters receivedfrom the SCS/AS 315.

Meanwhile, the Monitoring Request message transmitted by the SCEF 310may further include a monitoring configuration deletion parametergenerated based on the parameter commanding the deletion of themonitoring configuration which is previously received from the SCS/AS315.

The HSS 305 may perform authorization on the received Monitoring Requestmessage at operation 335. For example, the HSS 305 may check whether aparameter included in the Monitoring Request message has a value in arange acceptable by the operator.

The HSS 305 may send the MME/SGSN 300 an Insert Subscriber Data Requestmessage at operation 340. The insert subscriber data request message mayinclude subscriber information containing at least one of the followingparameters:

-   -   SCEF ID    -   SCEF reference ID    -   monitoring type    -   monitoring duration    -   subscribed periodic TAU/RAU timer

The SCEF ID, SCEF reference ID, monitoring type, and monitoring durationare parameters received from the SCEF 310. The tracking areaupdate/routing area update (TAU/RAU) timer is a timer for use inreceiving a periodic TAU/RAU message from the UE in association withmobility of the UE.

As described with operation 320, the maximum detection time correspondsto a mobility reachability timer of the mobile communication system, andthe HSS 305 cannot generate the mobility reachability timer value to theMME/SGSN 300. However, the MME/SGSN 300 may determine the mobilereachability timer value based on the subscribed periodic TAU/RAU timervalue included in the insert subscriber data request message.

Accordingly, the HSS 305 may adjust the subscriber periodic TAU/RAUtimer value such that the MME/SGSN sets the mobile reachability timer toa value equal to the maximum detection time under the assumption thatthe MME/SGSN 300 determines the mobile reachability timer value based onthe subscribed periodic TAU/RAU timer value.

In greater detail, the MME/SGSN 300 typically sets the mobilereachability timer to a value greater than that of the subscribedperiodic TAU/RAU timer. Here, the mobile reachability timer value may beset to a relatively large value depending on the mobile communicationsystem, area, or vendor (e.g. the mobile reachability timer may be setto a default value of 4 minutes). The HSS 305 may set the subscribedperiodic TAU/RAU timer to a value less than the maximum detection timebased on the above setting.

Meanwhile, the Insert Subscriber Data Request message transmitted by theHSS 305 may include the monitoring configuration deletion parameterreceived from the SCEF 310.

The MME/SGSN 300 may perform authorization on the monitoring-relatedparameter included in the received subscriber information at operation345. The MME/SGSN 300 may set the subscribed periodic TAU/RAU timer tothe same value as the periodic TAU/RAU timer value of the UE. It mayalso be possible to set the mobile reachability timer to a valueaccording to the (subscribed) periodic TAU/RAU timer value. Afterward,the MME/SGSN 300 may monitor the mobility reachability timer for expiryand, if the timer expires, notify the SCS/AS 315 of the expiry of thetimer via the SCEF 310.

The MME/SGSN 300 may delete the monitoring configuration based on thereceived monitoring configuration deletion parameter.

The MME/SGSN 300 may send the HSS 305 an Insert Subscriber Data Responsemessage at operation 350 after the monitoring configuration is performedsuccessfully.

The HSS 305 may send the SCEF 310 a Monitoring Response message toacknowledge the receipt of the Monitoring Request message or deletion ofthe monitoring configuration at operation 355.

The SCEF 310 may forward the Monitoring Response message to the SCS/AS315 to acknowledge the receipt of the Monitoring Request message ordeletion of the monitoring configuration at operation 360.

FIG. 4 is a signal flow diagram illustrating a subscriber informationupdate method, when the UE communication pattern is changed, accordingto an embodiment of the present disclosure. The UE communication patternmay include at least one of a traffic communication pattern and a UEmobility communication pattern.

Table 1 shows communication pattern parameters related to the datatraffic communication pattern.

TABLE 1 Communication pattern parameter Description 1) Periodic TRUE:The UE communicates periodically/False: communication No periodiccommunication, only on demand. indicator 2) Communication Durationinterval time of periodic communication duration timer [optional, may beused together with 1)] Example: every 5 minutes 3) Periodic timeInterval Time of periodic communication [optional, may be used togetherwith 1)] Example: every hour 4) Scheduled Time zone and Day of the weekwhen the UE is communication time available for communication [optional]Example: Time: 13:00-20:00, Day: Monday

Table 2 shows communication pattern parameters related to the UEmobility communication pattern.

TABLE 2 Communication pattern parameter Description 1) Stationaryindication TRUE: The UE is stationary/False: The UE is mobility[optional]

Referring to FIG. 4, an SCS/AS 415 may send the communication patterninformation of the UE via an SCEF 410 at operation 420. Thecommunication pattern information may include the aforementionedparameters. If the communication pattern parameters are changed, theSCS/AS 415 may send the SCEF 410 an update request message including thecommunication pattern information of the UE. The mobile communicationsystem may optimize various parameters and operations of the entitiesbased on the communication pattern. The communication patterninformation of the UE may be transmitted along with validity time. Thevalidity time may denote the time period during which when thecommunication pattern is valid. If the validity time expires, an HSS 405and/or an MME 400 may discard the communication pattern.

The SCEF 410 may check the validity of the parameters in thecommunication pattern information at operation 425. For example, theSCEF 410 may check whether the SCS/AS 415 is authorized to request forthe communication pattern information. The SCEF 410 may select acommunication pattern parameter based on the operator's policy orconfiguration.

The SCEF 410 may send the HSS 405 a communication pattern parameterupdate request (update CP) parameter request) message including aselected communication pattern and/or validity time at operation 430.

The HSS 405 may include the received communication pattern and/orvalidity time in the UE subscription information of the UE at operation435. That is, the HSS 405 may update the subscriber information of theUE.

The HSS 405 may send the SCEF 410 a communication pattern parameterupdate response (update CP parameter request) message at operation 440.

The SCEF 410 may send the SCS/AS 415 an Update Response message inresponse to the update request message at operation 445.

The MME 400 may receive the subscriber information of the UE whichincludes the communication pattern and/or validity time from the HSS 405at operation 450. This information may be used in generating an expectedUE behavior information element, expected UE activity behaviorinformation element, and assistance data conveyed in a paging that aretransferred to a base station or evolved node B (eNB) (not shown).

FIG. 5 is a block diagram illustrating a schematic configuration of anHSS according to an embodiment of the present disclosure.

Referring to FIG. 5, the HSS may include a communication unit (ortransceiver) 510 and a control unit (or processor) 520.

The communication unit 510 may communicate signals with another device(e.g. SCEF, MME, and SGSN) under the control of the control unit 520.

The control unit 520 may control the operations of the HSS (as describedwith reference to FIGS. 3 and 4) according to various embodiments of thepresent disclosure.

For example, the control unit 520 may control to receive a first requestmessage (e.g., the message transmitted at operation 330 of FIG. 3) fromthe SCEF. If the monitoring event information (e.g., monitoring type)included in the first request message is set to ‘loss of connectivity,’the first request message may further include a maximum detection timevalue.

If the monitoring event information is set to ‘loss of connectivity,’the control unit 520 may set a mobility-related timer (e.g., subscribedperiodic TAU/RAU timer) to a value based on the maximum detection timevalue included in the first request message. For example, the controlunit 520 may set the mobility-related timer of the UE to a value lessthan the maximum detection time.

The control unit 520 may send a mobility management entity (e.g., MMEand/or SGSN) a second request message (e.g., the message transmitted atoperation 340 of FIG. 3) including the monitoring event information andmobility-related timer value of the UE.

If the communication pattern of the UE is changed, the control unit 520may control to receive a fifth request message (e.g., the messagetransmitted at operation 430 of FIG. 4) including the firstcommunication pattern parameter and the validity time of the firstcommunication pattern parameter from the SCEF. The control unit 520 mayalso update the subscriber information of the corresponding UE based onthe first communication pattern parameter and its validity time. Thecontrol unit 520 may also delete the first communication patternparameter when the validity time expires. The control unit 520 maytransmit the first communication pattern parameter information andvalidity time information to the mobility management entity.

FIG. 6 is a block diagram illustrating a schematic configuration of anSCEF according to an embodiment of the present disclosure.

Referring to FIG. 6, the SCEF may include a communication unit (ortransceiver) 610 and a control unit (or processor) 620.

The communication unit 610 may communicate signals with another device(e.g., AS/SCS and HSS) under the control of the control unit 620.

The control unit 620 may control the operation of the SCEF (as describedwith reference to FIGS. 3 and 4) according to various embodiments of thepresent disclosure.

For example, the control unit 620 may control to receive a first requestmessage (e.g., the message transmitted at operation 420 of FIG. 4) froman external server (e.g., AS/SCS). If the monitoring event information(e.g., monitoring type) included in the first request message is set to‘loss of connectivity,’ the first request message may further include amaximum detection time value.

The control unit 420 may send the HSS a second request message (e.g. themessage transmitted at operation 430 of FIG. 4) including the monitoringevent information. If the monitoring event information is set to ‘lossof connectivity,’ the second request message may further include themaximum detection time. The HSS may set the mobility-related timer(e.g., subscribed periodic TAU/RAU timer) to a value based on themaximum detection time value. The mobility-related timer value of the UEmay be set to a value less than the maximum detection time.

If the communication pattern of the UE is changed, the control unit 620may control to receive a sixth request message (e.g., the messagetransmitted at operation 420 of FIG. 4) including the firstcommunication pattern parameter information and the validity timeinformation of the first communication pattern parameter from theexternal server. The control unit 620 may also control to send the HSS aseventh request message (e.g., the message transmitted at operation 430of FIG. 4) including the first communication pattern parameterinformation and the validity time information. The HSS may update thesubscriber information of the corresponding UE based on the firstcommunication pattern parameter and validity time. If the validity timeinformation and the second communication pattern parameter informationfor the same validity time are provided, the control unit 620 mayoverride the previously received first communication pattern parameterinformation.

Like the HSS and SCEF, each of the MME/SGSN and ACS/AS depicted in FIGS.3 and 4 may include a communication unit and a control unit. The controlunit may be implemented in the form of including a central processingunit (CPU) and a random access memory (RAM). The programs stored in anon-volatile memory are copied to the RAM and executed thereon toperform the above described operations.

As described above, the UE monitoring configuration method and apparatusof the present disclosure is advantageous in terms of providing the UEwith a more suitable service based on the UE-related event informationexchanged between an external server and a mobile communication system.

The term ‘control unit’ may be interchangeably used with the terms‘CPU,’ ‘microprocessor,’ ‘controller,’ ‘processor,’ and ‘operatingsystem.’ The control unit of each of the HSS, SCEF, MME, SGSN, andACS/AS may be integrated with other function units including thetransceiver of each of the HSS, SCEF, MME, SGSN, and ACS/AS into singlechip system (e.g., system-on-a-chip, system on chip, SOC, and SoC).

The above-described methods according to various embodiments of thepresent disclosure may be coded in software so as to be stored in anon-transitory readable medium. The non-transitory readable medium maybe mounted in various devices.

The non-transitory readable medium stores data semi-persistently, unlikea register, cache, and memory storing data temporarily, and readable bydevices. Examples of the non-transitory readable medium include acompact disk (CD), a digital versatile disc (DVD), a hard disc, Blu-raydisc, a universal serial bus (USB) memory card, a memory stick, and aread only memory (ROM).

While the present disclosure has been shown and described with referenceto various embodiments thereof, it will be understood by those skilledin the art that various changes in form and details may be made thereinwithout departing from the spirit and scope of the disclosure as definedby the appended claims and their equivalents.

What is claimed is:
 1. A method of a home subscriber server (HSS) in acommunication system, the method comprising: receiving, from a servicecapability exposure function (SCEF), a first monitoring request messageincluding monitoring event information and a value of a maximumdetection time; in case that the monitoring event information is set toloss of connectivity, setting a mobility-related timer of a terminal toa value smaller than the value of the maximum detection time, themobility-related timer including a subscribed periodic routing areaupdate/tracking area update (RAU/TAU); and transmitting, to a mobilitymanagement entity, a second monitoring request message including thevalue of the mobility-related timer of the terminal.
 2. The method ofclaim 1, wherein the value of the mobility-related timer of the terminalis included in the second monitoring request message in case that thevalue of the mobility-related timer of the terminal is modified.
 3. Themethod of claim 1, wherein the first and second monitoring requestmessages further include monitoring duration information which includesabsolute time information related to monitoring expiry.
 4. The method ofclaim 1, wherein the first and second monitoring request messagesfurther include monitoring configuration deletion information, andwherein a monitoring configuration is deleted by the mobility managemententity based on the monitoring configuration deletion information.
 5. Amethod of a service capability exposure function (SCEF), the methodcomprising: receiving, from an external server, a first monitoringrequest message including monitoring event information and a value of amaximum detection time; and transmitting, to a home subscriber server(HSS), a second monitoring request message including the monitoringevent information and the value of the maximum detection time, wherein amobility-related timer of a terminal is set by the HSS to a valuesmaller than the value of the maximum detection time in case that themonitoring event information is set to loss of connectivity, themobility-related timer including a subscribed periodic routing areaupdate/tracking area update (RAU/TAU), and wherein a third requestmessage including the value of the mobility-related timer of theterminal is transmitted from the HSS to a mobility management entity. 6.The method of claim 5, wherein the first to third monitoring requestmessages further include monitoring duration information includingabsolute time information related to monitoring expiry, and wherein thefirst to third monitoring request messages further include monitoringconfiguration deletion information, and a monitoring configuration isdeleted by the mobility management entity based on the monitoringconfiguration deletion information.
 7. A home subscriber server (HSS)comprising: a transceiver; and at least one processor coupled with thetransceiver and configured to control to: receive, from a servicecapability exposure function (SCEF), a first monitoring request messageincluding monitoring event information and a value of a maximumdetection time, in case that the monitoring event information is set toloss of connectivity, set a mobility-related timer of a terminal to avalue smaller than the value of the maximum detection time, themobility-related timer including a subscribed periodic routing areaupdate/tracking area update (RAU/TAU), and transmit, to a mobilitymanagement entity, a second monitoring request message including thevalue of the mobility-related timer of the terminal.
 8. The HSS of claim7, wherein the value of the mobility-related timer of the terminal isincluded in the second monitoring request message in case that the valueof the mobility-related timer of the terminal is modified.
 9. The HS Sof claim 7, wherein the first and second monitoring request messagesfurther include monitoring duration information which includes absolutetime information related to monitoring expiry.
 10. The HSS of claim 7,wherein the first and second monitoring request messages further includemonitoring configuration deletion information, and wherein a monitoringconfiguration is deleted by the mobility management entity based on themonitoring configuration deletion information.
 11. A service capabilityexposure function (SCEF), comprising: a transceiver; and at least oneprocessor coupled with the transceiver and configured to control to:receive, from an external server, a first monitoring request messageincluding monitoring event information and a value of a maximumdetection time, and transmit, to a home subscriber server (HSS), asecond monitoring request message including the monitoring eventinformation and the value of the maximum detection time, wherein amobility-related timer of a terminal is set by the HSS to a valuesmaller than the value of the maximum detection time in case that themonitoring event information is set to loss of connectivity, themobility-related timer including a subscribed periodic routing areaupdate/tracking area update (RAU/TAU), and wherein a third requestmessage including the value of the mobility-related timer of theterminal is transmitted from the HSS to a mobility management entity.12. The SCEF of claim 11, wherein the first to third monitoring requestmessages further include monitoring duration information includingabsolute time information related to monitoring expiry, and wherein thefirst to third monitoring request messages further include monitoringconfiguration deletion information, and a monitoring configuration isdeleted by the mobility management entity based on the monitoringconfiguration deletion information.